/* ── LAYOUT ─────────────────────────────── */
        html, body {
            height: 100%;
            margin: 0;
            overflow: hidden;
        }

        @media (max-width: 599px) {
            html, body {
                overflow-y: auto;
                height: auto;
                min-height: 100%;
            }
        }

        .app {
            display: flex;
            height: 100%;
        }

        /* ── SIDEBAR (desktop ≥1024px) ───────────── */
        .sidebar {
            width: var(--sidebar-w);
            border-right: 1px solid var(--border);
            background: var(--bg);
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            display: flex;
            flex-direction: column;
            z-index: 100;
            transition: transform .25s ease;
        }

        .sidebar-brand {
            padding: 18px 20px 16px;
            border-bottom: 1px solid var(--border);
        }

        .brand-name {
            font-family: 'Instrument Serif', serif;
            font-size: 1rem;
            color: var(--text);
            line-height: 1.4;
            display: block;
        }

        .brand-sub {
            font-size: 0.7143rem;
            color: var(--text3);
            letter-spacing: .1em;
            text-transform: uppercase;
            margin-top: 2px;
        }

        .sidebar-nav {
            flex: 1;
            padding: 10px 10px 0;
            overflow-y: auto;
            -webkit-overflow-scrolling: touch;
        }

        .nav-section-label {
            font-size: 0.7143rem;
            color: var(--text3);
            letter-spacing: .1em;
            text-transform: uppercase;
            padding: 10px 8px 4px;
        }

        .nav-item {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 8px 10px;
            border-radius: 6px;
            cursor: pointer;
            color: var(--text2);
            font-size: 0.9286rem;
            font-weight: 400;
            transition: color .15s, background .15s;
            user-select: none;
            white-space: nowrap;
        }

        .nav-item:hover {
            color: var(--text);
            background: var(--surface)
        }

        .nav-item.active {
            color: var(--text);
            background: var(--surface2)
        }

        .nav-item svg {
            width: 15px;
            height: 15px;
            opacity: .5;
            flex-shrink: 0
        }

        .nav-item.active svg {
            opacity: 1
        }

        .sidebar-footer {
            padding: 14px 20px;
            border-top: 1px solid var(--border);
        }

        .dot {
            display: inline-block;
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--success);
            margin-right: 6px;
            animation: blink 2s infinite
        }

        @keyframes blink {

            0%,
            100% {
                opacity: 1
            }

            50% {
                opacity: .3
            }
        }

        .status-txt {
            font-size: 0.7857rem;
            color: var(--text2)
        }

        /* ── TOP BAR (tablet 600–1023px) ────────── */
        .topbar {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--topbar-h);
            background: var(--bg);
            border-bottom: 1px solid var(--border);
            align-items: center;
            justify-content: space-between;
            padding: 0 20px;
            z-index: 100;
            gap: 15px;
            overflow: hidden;
        }

        .topbar-brand {
            font-family: 'Instrument Serif', serif;
            font-size: 1.0714rem;
            color: var(--text);
        }

        .topbar-tabs {
            display: flex;
            gap: 2px;
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: 7px;
            padding: 3px;
            overflow-x: auto;
            scrollbar-width: none;
            -ms-overflow-style: none;
        }
        .topbar-tabs::-webkit-scrollbar { display: none; }

        .topbar-tab {
            padding: 5px 12px;
            font-size: 0.8571rem;
            color: var(--text2);
            border-radius: 5px;
            cursor: pointer;
            transition: all .15s;
            white-space: nowrap;
        }

        .topbar-tab.active {
            background: var(--surface2);
            color: var(--text)
        }

        /* ── BOTTOM NAV (mobile <600px) ─────────── */
        .bottomnav {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            height: var(--bottomnav-h);
            background: var(--bg);
            border-top: 1px solid var(--border);
            z-index: 100;
            padding-bottom: env(safe-area-inset-bottom);
        }

        .bottomnav-inner {
            display: flex;
            height: 100%;
        }

        .bn-item {
            flex: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 3px;
            cursor: pointer;
            color: var(--text3);
            transition: color .15s;
            font-size: 0.65rem;
            font-weight: 500;
            letter-spacing: .01em;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .bn-item.active {
            color: var(--text)
        }

        .bn-item svg {
            width: 18px;
            height: 18px
        }

        /* ── MAIN CONTENT ───────────────────────── */
        .main {
            margin-left: var(--sidebar-w);
            flex: 1;
            height: 100%;
            display: flex;
            flex-direction: column;
            overflow: hidden;
        }

        .content {
            flex: 1;
            max-width: 1000px;
            width: 100%;
            padding: 0;
            margin: 0 auto;
            position: relative;
            overflow: hidden;
        }

        @media (max-width: 599px) {
            .content {
                overflow: visible;
                height: auto;
            }
        }

        /* ── PAGE HEADER ────────────────────────── */
        .page-hd {
            margin-bottom: 28px;
            padding-bottom: 22px;
            border-bottom: 1px solid var(--border);
        }

        .page-title {
            font-family: 'Instrument Serif', serif;
            font-size: 1.7143rem;
            font-weight: 400;
            color: var(--text);
            margin-bottom: 4px;
        }

        .page-desc {
            font-size: 0.9286rem;
            color: var(--text2)
        }

        /* ════════════════════════════════════════
   RESPONSIVE BREAKPOINTS
   ════════════════════════════════════════ */

        /* ── TABLET 600–1023px ──────────────────── */
        @media(min-width:600px) and (max-width:1023px) {
            .sidebar {
                display: none
            }

            .topbar {
                display: flex
            }

            .bottomnav {
                display: none
            }

            .main {
                margin-left: 0
            }

            .content {
                padding: 0;
                max-width: 100%;
            }
            .tab-section {
                padding: calc(var(--topbar-h) + 28px) 28px 40px !important;
            }

            .metrics {
                grid-template-columns: repeat(3, 1fr)
            }
        }

        /* ── MOBILE <600px ───────────────────────── */
        @media(max-width:599px) {
            .sidebar {
                display: none
            }

            .topbar {
                display: none
            }

            .bottomnav {
                display: block
            }

            .main {
                margin-left: 0
            }

            .content {
                padding: 0;
                max-width: 100%;
            }
            .tab-section {
                padding: 20px 16px calc(var(--bottomnav-h) + 20px) !important;
            }

            .page-title {
                font-size: 1.4286rem
            }

            .metrics {
                grid-template-columns: repeat(3, 1fr)
            }

            .metric {
                padding: 12px 10px
            }

            .metric-val {
                font-size: 1.2143rem
            }

            .block-body {
                padding: 14px
            }

            .block-head {
                padding: 10px 14px
            }

            .cost-strip {
                gap: 8px 14px
            }

            .btn {
                padding: 12px 20px;
                font-size: 1rem
            }

            input[type=text],
            input[type=password],
            textarea,
            select {
                font-size: 1.1429rem;
                padding: 10px 12px
            }

            /* prevent zoom on iOS */
            .row-item {
                flex-wrap: wrap
            }
        }

        /* ── DESKTOP ≥1024px ────────────────────── */
        @media(min-width:1024px) {
            .sidebar {
                display: flex
            }

            .topbar {
                display: none
            }

            .bottomnav {
                display: none
            }

            .main {
                margin-left: var(--sidebar-w)
            }
        }

        /* Extra large: cap content width nicely */
        @media(min-width:1400px) {
            .tab-section {
                padding-left: 64px !important;
                padding-right: 64px !important;
            }
        }

/* ── CONTACTS & USERS GRID ──────────────────────── */
.contacts-grid,
.users-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    align-items: start;
}

.broadcast-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    align-items: start;
}

@media(min-width: 1024px) {
    .contacts-grid,
    .users-grid {
        grid-template-columns: 320px 1fr;
    }
    .broadcast-grid {
        grid-template-columns: 1fr 320px;
    }
}

.dir-block {
    display: flex;
    flex-direction: column;
}

.dir-block .table-wrap {
    overflow-y: auto;
    max-height: 55vh;
}

@media(min-width: 2560px) {
    .content {
        max-width: 800px !important;
        margin: 0 auto;
    }
}